Cold rolling solution



- other source of heat for Patented Oct. 7, 1941 UNITED STATES ATEN OFFICE.

coLn noLmNe sow'rron Elmer Harris, Birmingham, Ala.

1% Drawing.

6 Claims;

well suited for the dual function of cooling and lubricating material undergoing reduction between the rolls in a rolling mill. While not limited thereto, the solution is well suited for. cooling strip material undergoing a rolling'operation on a cold reduction mill such as used in a tin mill.

' Solutions heretofore used were made by adding approximately equal parts of soluble oil and palm oil to a sufficient quantityof water to produce a solution containing the desired percent: age of palm oil. Such old solutions for successful operations must be maintained'at a temperature of approximately 125 degrees Fahrenheit at all times. This necessitates the'use Application March 6, 1939, Serial No. 269,150

, (CL 252-1 1) This invention relates to a solution peculiarly successfully used at temperatures ranging from 55 to 155 degrees Fahrenheit and no special of a large amount of steam or other source of proved cold solution has been shown in practiceto be more satisfactory than the'hot solutions heretofore used.

Q heat, which is costly and undesirable. In a hot The solution comprises 100 gallons of palm I oil, 2 /2 gallons triethanolamine and 'lgallons of an oil known to those skilled in the art as tall oil. The tall oil is a composition of fatty acids and rosin acids. The' composition may vary somewhat, but an average composition would be:

Per cent Fatty acids, oleic and others Rosin. acid (crude) 42 Water 23 The tall oil is a by-product from the manufacture of paper pulp and is preferable for use be cause of its availability and low cost.

In practice I have found that the above enumerated cold solution is superior to the hot solutions heretofore used for the following reasons. It costs from 20 to 35 per cent less to make up, as the solution will do the work of hot solutions heretofore used which contained approximately 100 gallons of palm oil and 100 gallons of soluble oil. The cost is still further reduced due to the fact that more palm oil can additional emulsifier.

The improved solution requires no steam or keeping it hot. Practice has demonstrated that my novel are quite unstable below eating is required once it has been mixed. 1

The fact that the cold solutionis usable at room temperature, whereas the ordinary hot solution heretofore used is applied at a minimum:

temperature of approximately 125 degrees Eahrenheit, allows for considerably more cooling of the work, rolls. It has been demonstrated in practice that it is easier to secure and maintain the gage of the strip when my cold solution is used.

There is no loss, or at least very little, of palm oil due to the breakdown thereof into soluble oil due to high temperature or from the presence.

of soluble oil in the solution, as is the case with hot solutions heretofore used. Less total oil is required to maintain the desired percentage of oil in the solution. To the cold solution is added only the amount of -palm oil to give the required percentage, whereas in the hot solutions heretofore used approximatelyan equal amount of soluble oil must be added.

The cold solution specified involves the saponiflcatlon of oleic and rosin acids and the emulsifying power. of this soap. The soap is free of excessive alkalinity, yet it retains the adhesive power of the rosin soap, causing a very thin film of emulsifier and palm oil to be retained metal surface being rolled.

Palm oil is not readily emulsified in, or with, most emulsifiers, and emulsions made with them the meltingpoint of the palm oil. However, by adding oleic or rosin acids, or a combination of the two, to thepalm oil and some active saponifler to the water, then making a mixture by adding the oil mix to the water and saponifier, an emulsion is formed which is very stable as arolling solution.

be added without solution can be In preparing the cold rolling solution above specified, I mix together gallons of palm oil and 7 gallons of tall oil, the palm oil having first been brought to a temperature of approximately degrees Fahrenheit. In gallons of triethanolamine is added to the water in the solution tank at room temperature and mixed thoroughly. Thenthe oil and acid mix is added to the water and triethanolamine mix and the whole is agitated until thoroughly mixed, whereupon it is ready for use.

In using the above solution or water emulsion for serving the dual function of collant and lubricant, there is no definitemr critical limit as to the amount of water which is to be added. It may be made up to contain any desired peron the v the meantime, 2 /2.

centage of oil. In using this solution for cold rolling operations in tin mills, I have found that in a 4,000 gallon batch the water may range from 3,680 to 3,440 gallons. Expressed in percentages, this means that the solution or emulsion may range from 8 to 14 per cent of'oil.

The above solution may serve as a combined lubricant and coolant for material being subjected to a-rolling operation, audit is to be understood that the cooling function is operative above normal room temperatures. In fact, practice has demonstrated the effectiveness-of the cooling and lubricating characteristics of my novel solution in the cold rolling of stock in a 'of the invention, as defined in the following claims. g

I claim: 1. A lubricant for material being subjected to rolling comprising an emulsion of palm oil, triethanolamine, tall oil and water.-

amount to cause proper adhesiveness.

4. A lubricant for material being subjected to a rolling operation comprising approximately 100 parts of palm oil, 7 parts of a mixture of oleic I and rosin acids and 2 parts of triethanolamine,

tin mill at solution'temperatures ranging from'50 .15

plus a substantial amount of water; the rosin acid being present in sufiicient amount to cause proper adhesiveness.

-. 5. A lubricant for material being subjected to a rolling operation comprising a water emulsion of palm oil, a mixture of higher fatty acids and rosin acids in approximately the proportions in which they occur in tall 011.

6. An emulsion for use as a combined lubrican and coolant for material being subjected to a rolling operation comprising parts of palm oil, 2 parts of triethanolamine and a mixture of higher fatty acids and rosin acids in approximately the proportions in which they occur in tall oil in sufficient amount to cause proper adhesiveness, plus a substantial amount of water.

ELMER F. HARRIS. 

